neobjavljeni prilog sa skupa
In order to improve the growth of plants and increase their production and quality, during the cultivation itself it is necessary to protect the plants from unfavorable conditions (hail, frost, wind, birds, insects, etc.). Covering systems (greenhouses) are protected spaces where different types of plants can grow. They consist of a structural part and a covering part. Various greenhouse constructions are available on the market, from simple plastic or composite structures to more complex ones with a metal frame. The paper examines whether epoxy matrix reinforced with coconut fibers can be used for structural part of greenhouses. Recently, more and more industries are turning to the production and application of natural composites, i.e. composites reinforced with natural fibers. The main reason for that is that countries with high production and consumption of certain plants face the problem of proper waste disposal. Most often, the remains (fibers, husks) are burned or disposed of, which greatly harms the environment. In order for natural fibers to be used for this purpose, they are first chemically modified with different concentrations of alkali and thus prepared to be compatible with the matrix. The highest tensile properties (tensile modulus of 2600 MPa and tensile strength of 29 MPa) were obtained when the fibers were immersed in sodium hydrogen carbonate NaHCO3 solution for 5 days with a solution concentration of 15% and with a fiber content in the composite of 10%. Compared to the test results of pure epoxy resin, the tensile strength increased by 68% and the modulus of elasticity by 85%. The obtained tensile test results were also compared with the FEM analysis of the shape of a tube with an outer diameter of 120 mm and a wall thickness of 20 mm.
coconut fibers; greenhouses; tensile properties
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